Interstellar Cultivation

What if you one day suddenly wake up and found that the earth is destroyed and you are the only living being alive in the world. What if the things you thought that only existed in the myths and legends becomes true. After the world is destroyed Jun Heng finds that he had become immortal and that there are other civilizations besides humans and they are highly advanced in technologies. Jun Heng wants to leisurely spend his days lazily and discover new things but when he is targeted by the enemies he slaps them across the stars